这里有一些很好的答案，但我认为这是最简单的。 在Laravel 5.4(以及之前的版本)中，你可以在方便的地方创建一个类，比如App/Libraries/Helper.php

class Helper() {
    public function uppercasePara($str) {
        return '<p>' .strtoupper($str). '<p>;
    }
}

然后你可以像这样简单地在你的Blade模板中调用它:

@inject('helper', \App\Libraries\Helper)
{{ $helper->drawTimeSelector() }}

如果你不想使用@inject，那么就把'uppercasePara'函数设置为静态的，并像这样将调用嵌入到你的Blade模板中:

{{ \App\Libraries\Helper::drawTimeSelector() }}

不需要别名。Laravel自动解析具体类。

下面是我创建的一个bash shell脚本，用于快速制作Laravel 5外观。

在Laravel 5安装目录中运行这个程序。

这样叫它:

make_facade.sh -f <facade_name> -n '<namespace_prefix>'

例子:

make_facade.sh -f helper -n 'App\MyApp'

如果你运行这个例子，它会在“your_laravel_installation_dir/app/MyApp”下创建目录Facades和Providers。

它将创建以下3个文件，并将它们输出到屏幕上:

./app/MyApp/Facades/Helper.php
./app/MyApp/Facades/HelperFacade.php
./app/MyApp/Providers/HelperServiceProvider.php

完成后，它将显示类似于下面的消息:

===========================
    Finished
===========================

Add these lines to config/app.php:
----------------------------------
Providers: App\MyApp\Providers\HelperServiceProvider,
Alias: 'Helper' => 'App\MyApp\Facades\HelperFacade',

更新'config/app.php'中的Providers和Alias列表

运行composer -o dumpautoload

"./app/MyApp/Facades/Helper.php"最初看起来是这样的:

<?php

namespace App\MyApp\Facades;


class Helper
{
    //
}

现在只需在“。/app/MyApp/Facades/Helper.php”中添加方法。

下面是“。/app/MyApp/Facades/Helper.php”在我添加了一个Helper函数后的样子。

<?php

namespace App\MyApp\Facades;

use Request;

class Helper
{
    public function isActive($pattern = null, $include_class = false)
    {
        return ((Request::is($pattern)) ? (($include_class) ? 'class="active"' : 'active' ) : '');
    }
}

This is how it would be called:
===============================

{!!  Helper::isActive('help', true) !!}

这个函数需要一个模式，并且可以接受可选的第二个布尔参数。

如果当前URL匹配传递给它的模式，它将输出'active'(或者'class="active"'，如果你添加'true'作为函数调用的第二个参数)。

我用它来突出显示激活的菜单。

下面是我的脚本的源代码。我希望你觉得它有用，如果你有任何问题请告诉我。

#!/bin/bash

display_syntax(){
    echo ""
    echo "  The Syntax is like this:"
    echo "  ========================"
    echo "      "$(basename $0)" -f <facade_name> -n '<namespace_prefix>'"
    echo ""
    echo "  Example:"
    echo "  ========"
    echo "      "$(basename $0) -f test -n "'App\MyAppDirectory'"
    echo ""
}


if [ $# -ne 4 ]
then
    echo ""
    display_syntax
    exit
else
# Use > 0 to consume one or more arguments per pass in the loop (e.g.
# some arguments don't have a corresponding value to go with it such
# as in the --default example).
    while [[ $# > 0 ]]
    do
        key="$1"
            case $key in
            -n|--namespace_prefix)
            namespace_prefix_in="$2"
            echo ""
            shift # past argument
            ;;
            -f|--facade)
            facade_name_in="$2"
            shift # past argument
            ;;
            *)
                    # unknown option
            ;;
        esac
        shift # past argument or value
    done
fi
echo Facade Name = ${facade_name_in}
echo Namespace Prefix = $(echo ${namespace_prefix_in} | sed -e 's#\\#\\\\#')
echo ""
}


function display_start_banner(){

    echo '**********************************************************'
    echo '*          STARTING LARAVEL MAKE FACADE SCRIPT'
    echo '**********************************************************'
}

#  Init the Vars that I can in the beginning
function init_and_export_vars(){
    echo
    echo "INIT and EXPORT VARS"
    echo "===================="
    #   Substitution Tokens:
    #
    #   Tokens:
    #   {namespace_prefix}
    #   {namespace_prefix_lowerfirstchar}
    #   {facade_name_upcase}
    #   {facade_name_lowercase}
    #


    namespace_prefix=$(echo ${namespace_prefix_in} | sed -e 's#\\#\\\\#')
    namespace_prefix_lowerfirstchar=$(echo ${namespace_prefix_in} | sed -e 's#\\#/#g' -e 's/^\(.\)/\l\1/g')
    facade_name_upcase=$(echo ${facade_name_in} | sed -e 's/\b\(.\)/\u\1/')
    facade_name_lowercase=$(echo ${facade_name_in} | awk '{print tolower($0)}')


#   Filename: {facade_name_upcase}.php  -  SOURCE TEMPLATE
source_template='<?php

namespace {namespace_prefix}\Facades;

class {facade_name_upcase}
{
    //
}
'


#  Filename: {facade_name_upcase}ServiceProvider.php    -   SERVICE PROVIDER TEMPLATE
serviceProvider_template='<?php

namespace {namespace_prefix}\Providers;

use Illuminate\Support\ServiceProvider;
use App;


class {facade_name_upcase}ServiceProvider extends ServiceProvider {

    public function boot()
    {
        //
    }

    public function register()
    {
        App::bind("{facade_name_lowercase}", function()
        {
            return new \{namespace_prefix}\Facades\{facade_name_upcase};
        });
    }

}
'

#  {facade_name_upcase}Facade.php   -   FACADE TEMPLATE
facade_template='<?php

namespace {namespace_prefix}\Facades;

use Illuminate\Support\Facades\Facade;

class {facade_name_upcase}Facade extends Facade {

    protected static function getFacadeAccessor() { return "{facade_name_lowercase}"; }
}
'
}


function checkDirectoryExists(){
    if [ ! -d ${namespace_prefix_lowerfirstchar} ]
    then
        echo ""
        echo "Can't find the namespace: "${namespace_prefix_in}
        echo ""
        echo "*** NOTE:"
        echo "           Make sure the namspace directory exists and"
        echo "           you use quotes around the namespace_prefix."
        echo ""
        display_syntax
        exit
    fi
}

function makeDirectories(){
    echo "Make Directories"
    echo "================"
    mkdir -p ${namespace_prefix_lowerfirstchar}/Facades
    mkdir -p ${namespace_prefix_lowerfirstchar}/Providers
    mkdir -p ${namespace_prefix_lowerfirstchar}/Facades
}

function createSourceTemplate(){
    source_template=$(echo "${source_template}" | sed -e 's/{namespace_prefix}/'${namespace_prefix}'/g' -e 's/{facade_name_upcase}/'${facade_name_upcase}'/g' -e 's/{facade_name_lowercase}/'${facade_name_lowercase}'/g')
    echo "Create Source Template:"
    echo "======================="
    echo "${source_template}"
    echo ""
    echo "${source_template}" > ./${namespace_prefix_lowerfirstchar}/Facades/${facade_name_upcase}.php
}

function createServiceProviderTemplate(){
    serviceProvider_template=$(echo "${serviceProvider_template}" | sed -e 's/{namespace_prefix}/'${namespace_prefix}'/g' -e 's/{facade_name_upcase}/'${facade_name_upcase}'/g' -e 's/{facade_name_lowercase}/'${facade_name_lowercase}'/g')
    echo "Create ServiceProvider Template:"
    echo "================================"
    echo "${serviceProvider_template}"
    echo ""
    echo "${serviceProvider_template}" > ./${namespace_prefix_lowerfirstchar}/Providers/${facade_name_upcase}ServiceProvider.php
}

function createFacadeTemplate(){
    facade_template=$(echo "${facade_template}" | sed -e 's/{namespace_prefix}/'${namespace_prefix}'/g' -e 's/{facade_name_upcase}/'${facade_name_upcase}'/g' -e 's/{facade_name_lowercase}/'${facade_name_lowercase}'/g')
    echo "Create Facade Template:"
    echo "======================="
    echo "${facade_template}"
    echo ""
    echo "${facade_template}" > ./${namespace_prefix_lowerfirstchar}/Facades/${facade_name_upcase}Facade.php
}


function serviceProviderPrompt(){
    echo "Providers: ${namespace_prefix_in}\Providers\\${facade_name_upcase}ServiceProvider,"
}

function aliasPrompt(){
    echo "Alias: '"${facade_name_upcase}"' => '"${namespace_prefix_in}"\Facades\\${facade_name_upcase}Facade'," 
}

#
#   END FUNCTION DECLARATIONS
#


###########################
## START RUNNING SCRIPT  ##
###########################

display_start_banner

init_and_export_vars
makeDirectories 
checkDirectoryExists
echo ""

createSourceTemplate
createServiceProviderTemplate
createFacadeTemplate
echo ""
echo "==========================="
echo "  Finished TEST"
echo "==========================="
echo ""
echo "Add these lines to config/app.php:"
echo "----------------------------------"
serviceProviderPrompt
aliasPrompt
echo ""

首先在App\Http目录中创建helpers.php。 然后在composer.json中添加以下代码

"autoload": {
        "classmap": [
            "database"
        ],
        "files": [
            "app/Http/helpers.php"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },

执行如下命令

composer dump-autoload

现在可以在helpers.php文件中定义自定义函数。

在SO和谷歌上筛选了各种各样的答案后，我仍然没有找到一个最佳的方法。大多数答案建议我们离开应用程序，依靠第三方工具Composer来完成工作，但我不相信仅仅为了包含一个文件而耦合到一个工具是明智的。

Andrew Brown的回答最接近我认为应该如何处理它，但是(至少在5.1中)，服务提供者步骤是不必要的。Heisian的回答强调了PSR-4的使用，这让我们更接近了一步。下面是视图中helper的最终实现:

首先，在你的app目录中创建一个helper文件，命名空间为:

namespace App\Helpers;

class BobFinder
{
    static function bob()
    {
        return '<strong>Bob?! Is that you?!</strong>';
    }
}

接下来，在config\app.php中，在aliases数组中为你的类添加别名:

'aliases' => [
    // Other aliases
    'BobFinder' => App\Helpers\BobFinder::class
]

这就是你需要做的。PSR-4和别名应该向你的视图公开helper，所以在你的视图中，如果你输入:

{!! BobFinder::bob() !!}

它应该输出:

<strong>Bob?! Is that you?!</strong>

我最初的想法是作曲家的自动加载，但它对我来说不太像Laravel 5。L5大量使用了服务提供者，它们引导你的应用程序。

首先，我在我的应用程序目录中创建了一个名为Helpers的文件夹。然后在Helpers文件夹中，我为我想添加的功能添加了文件。在一个文件夹中放置多个文件可以避免一个大文件变得太长而难以管理。

接下来，我通过运行artisan命令创建了一个HelperServiceProvider.php:

artisan make:provider HelperServiceProvider

在register方法中，我添加了这个代码片段

public function register()
{
    foreach (glob(app_path().'/Helpers/*.php') as $filename){
        require_once($filename);
    }
}

最后，在config/app.php的providers数组中注册服务提供者

'providers' => [
    'App\Providers\HelperServiceProvider',
]

现在，您的Helpers目录中的任何文件都已加载，并准备使用。

更新2016-02-22

There are a lot of good options here, but if my answer works for you, I went ahead and made a package for including helpers this way. You can either use the package for inspiration or feel free to download it with Composer as well. It has some built in helpers that I use often (but which are all inactive by default) and allows you to make your own custom helpers with a simple Artisan generator. It also addresses the suggestion one responder had of using a mapper and allows you to explicitly define the custom helpers to load, or by default, automatically load all PHP files in your helper directory. Feedback and PRs are much appreciated!

composer require browner12/helpers

Github：布朗纳12/助手

在app/Helper/Helpers.php中创建Helpers.php

namespace App\Helper
class Helpers
{


}

添加作曲家和作曲家更新

 "autoload": {
        "classmap": [
            "database/seeds",
            "database/factories",
            "database","app/Helper/Helpers.php"
        ],
        "psr-4": {
            "App\\": "app/"
        },
         "files": ["app/Helper/Helpers.php"]
    },

在控制器中使用

use App\Helper\Helpers

视图中使用 修改config->app.php文件

   'aliases' => [
    ...
    'Helpers'   => 'App\Helper\Helpers'
    ],

视图中调用

<?php echo Helpers::function_name();  ?>